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UNITED STATES PATENT OFFICE.

SMITH TV. KIMBLE, OF DENVER, COLORADO, ASSIGXOR TO THE MIOA ASBETITE INSULATING COHPANY, OF SAME PLACE.

COMPOSITION OF MATTER F OR INSULATING PURPOSES, 800.

SPECIFICATION forming part of Letters Patent No. 464,369, dated December 1, 1891.

Application filed February 26, 1891.

To whom it may concern:

Be it known that I, SMITH W. KIMBLE, a citizen of the United States, and a resident of Denver, county of Arapahoe, State of C010- rado, have invented a new and useful Composition of Matter for Insulating Purposes, &c., which composition is fully set forth in the following specification.

This invention relates to the preparation of IO compositions of matter containing a large proportion of pulverized mica, which imparts thereto the properties of self-lubrication and resistance to fire and heat which character ize that mineral.

:5 In another application filed February 2-1,

1891, Serial No. 382,577, I have referred to' the difficulties of combining mica with a mineral-binding agent, such as silicate of soda, and have described a compound in which these substances are caused to cohere and unite permanentlyunder high pressure without baking by the addition of another mineral substance, such as talc free from lime.

The present invention is for a composition belonging to the same class, the distinguishing feature of which is the addition of sulphur. This element makes the compound harder, more dense, and refractory, and does not impair in any degree its utility as an elec- 0 trical insulator.

In preparing the composition I prefer to use natural sulphur compounds, such as iron co )er, or antimon rites crushed (TIE-m d Io a line powder, Though I may employ commercial flour of sulphur or a suitable sulphur compoun o ier an those above mentioned. The use of sulphur in this composition is of great importance in adding to its cohesiveness, hardness, and durability. The

0 composition prepared as herein described is very destinctive in its appearance and prop- Serial No. 382,871. (Specimens) powdered sul hur com ound such as indicated, fifty parfs of Hnelyowdered mica fifty feldsparfl and from three 0 en parts of solue g ass depending on the dryness of the mass. hese ingredients, being thoroughly mixed, are molded under high ressure as described in the aforesaid applicafion. The composition is also preferably waterproofed,

as therein described.

Substantially the same composition may be produced by using in place of pyrites oxides or chlorides of the metals s ecified WIIZE sul- Eur--say 1n the form of hour of sulphur.

I illineral pigments may be also added as may be desired.

I clai m- The herein-described hard, dense, and refractory composition of matter having the property of resistance to heat and electricity and of being molded under high pressure without heat, said composition being composed of pulverized mica, silicate of soda, sulphur or sulphur compound, and another mineral substance,such as finely-divided asbestus.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

SMITH \V. KIMBLE.

Witnesses:

PHILIP MAURO,

ertics and of far greater utility than those J ONA B. CILLEY.

parts of finely-divided asbestus Ior powdered 5 5 

